Flywheel Inertia Data: rimmed
Flywheel inertia and energy storage reference data for speed regulation and press design — solid disc, rimmed, spoked, and composite rotor configurations across cast iron, steel, aluminum, and carbon fiber composite materials; covers small (5–12 in OD), medium (12–36 in OD), and large (36–72 in OD) size ranges
| flywheel type | flywheel id | allowable stress psi (psi) | coefficient of fluctuation typical | density lb in3 (lb/in3) | energy stored ft lb at 1000rpm (ft_lbf) | inner diameter in (in) | mass lb (lb) | material | max rim speed ft per s (ft/s) | moment of inertia lb ft2 (lb_ft2) | notes | outer diameter in (in) | typical applications | width in (in) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| rimmed | rimmed_ci_12 | 6,000 | 0.1 | 0.26 | 285 | 10 | 17.8 | cast_iron | 50 | 0.527 | Rim section: 1 in thick × 3 in wide; hub+spokes approx 15% of total I; rim carries 85-90% of WR2; Cs=0.10-0.15 for presses | 12 | single-cylinder engines; punching presses; rock crushers | 3 |
| rimmed | rimmed_ci_18 | 6,000 | 0.1 | 0.26 | 1,267 | 15.5 | 41.2 | cast_iron | 50 | 2.345 | Rim mean dia 16.75 in; 1.25 in rim section; Cs=0.10-0.15 for press work | 18 | medium punch presses; shearing machines; single-cyl steam engines | 4 |
| rimmed | rimmed_ci_24 | 6,000 | 0.12 | 0.26 | 3,041 | 21 | 62.4 | cast_iron | 50 | 5.631 | Rim section approx 1.5 in × 4.5 in; large energy storage per unit mass vs solid disc | 24 | large punch presses; stamping machines; 2-cyl steam engines | 4.5 |
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